ekf2: don't ignore function argument (#4990)

src/modules/ekf2/ekf2_main.cpp

@@ -116,7 +116,7 @@ public:
 	 */
 	int		start();
 
-	void 	set_replay_mode(bool replay) {_replay_mode = true;};
+	void 	set_replay_mode(bool replay) {_replay_mode = replay;};
 
 	static void	task_main_trampoline(int argc, char *argv[]);